'use strict';
function one_add_next_multiply_three(collection){
 var arr=[];
 for(let i=0;i<collection.length-1;i++){
     let a=(collection[i]+collection[i+1])*3;
     arr.push(a);
 }
 console.log(arr);
 
 return arr;
 // return [12,24,36,48,60,72,84,96,108,120];
}
module.exports = one_add_next_multiply_three;
